Yesterday, I took my little DIY Mutable Instruments Anushri and went to play with the modular boys in town. It was very inspiring.
One person had a big Doepfer setup and the other had a smaller setup with hand picked modules of different brands.
One module in particular got my attention:

The Bubblesound uLFO.

That thing is amazing. It's range for one cycle goes from approx an hour and way up into the audible range, at 3,6kHz, making it a nice oscillator and all in all, it is just a quite versatile module with many parameters and CV possibilities.

The owner had two of them and especially when getting them to modulate each other, they produced some very impressive sounds that the big Doepfer rig with all its modules couldn't mimic.
I liked the sound of the uLFO as an oscillator much better than the Doepfer A110 even though being a VCO is not it's main goal.

I crave that Bubblesound uLFO... but being a student, price is an issue, so I am looking for a way to build one.

I am no engineer and cannot design one myself. Not yet, anyway. But maybe some of you know of advanced DIY projects for something similar to this?

I've had two ideas about this,
1. An old idea about a module based LFO/EG. You stack the modules next to each other to create different slope speeds between stages. To make a complex LFO, you loop the output back to the start. The timing for each stage could be chargetime related, or it could be forced by a digital timing signal, (works kinda like a sync on a VCO but at low frequencies)
Gate, and/or trigger signals can force or hold up any stage, (for Envelope generator applications)
and,.........
You can add as many stages as you like.

2. A lot simpler, (and newer) idea is a 4017 cycling/resetting/changing steps, with a 100K pot from each output to ground, (Event Horizon style) wipers summed into a TL072 buffer with a glide cap on the feedback, adjustable. Other op-amp gives an inverted output.
Actually, with a TL074 you could get all four:-
Normal
Inverted
Glide
Glide inverted

Three chips and it's done.
If you use a 40106 for the main clock/trigger in processing, that still leaves 4 inverters to send the opposite to the summer, or not, I think.

Which kinda makes it a bit Klee Sequencer, but on a much simpler level. The Klee is, by the way, a really cool complex LFO if you hook it up that way. _________________What makes a space ours, is what we put there, and what we do there.

the part that´s in the left lower corner repeated twice, it´s not exactly an advanced LFO but a very nice beginner circuit, with different timing capacitors can do wide freq range and in fact the ken stone psycho lfo is just this thing six times and intermodulating and THAT is a very cool module!

I'd like to try an Arduino one day, but at the moment it's just not in my budget to set it all up.

well, you can buy an atmega328 with the arduino bootloader, a usb>serial doodad, a crystal and 2 caps pretty cheap, and whammo! a diy arduino for about 1/6th of the price of a "proper" one.
__________________Richard_

Yes, Arduino has been in my mind for quite some time now. I will probably dig into it at some point. A lot of possibilities seem to come with those little things!

How about an LFO whose waveshape is analogus to an iteration graph across the mandelbrot set where the origin is set by two incoming CVs and the angle of the slice is set by a third CV, driven by another LFO!! _________________What makes a space ours, is what we put there, and what we do there.

The MOTM-320 is what I would call an "advanced LFO." CVable (freq and shape), temperature compensated, very wide range. Synth Tech has a nice manual that you can download here. You would certainly be able to save a fair bit of money over the Bubblesound if you bought the PCB from Bridechamber for 40 bucks and sourced the other parts yourself.

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